Navigable endobronchial tool to access tissue outside a bronchus

ABSTRACT

Methods, systems, and devices for accessing tissue outside a bronchus and marking the location of a biopsy are provided. The method includes loading a navigation plan into a navigation system with the navigation plan including a CT volume generated from a plurality of CT images, inserting an extended working channel (EWC) including a location sensor into a patient&#39;s airways, registering a sensed location of the EWC with the CT volume of the navigation plan, and selecting a target in the navigation plan located outside the periphery of a patient&#39;s airways. The method further includes navigating the EWC and location sensor proximate the target, inserting a piercing catheter into the EWC, piercing through an airway wall to reach the target, storing a position of the location sensor in the navigation system as a biopsy location, and performing a biopsy at the stored biopsy location.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of and priority to U.S.Provisional Patent Application Ser. No. 62/279,373 entitled NAVIGABLEENDOBRONCHIAL TOOL TO ACCESS TISSUE OUTSIDE A BRONCHUS, filed on Jan.15, 2016, by Herdina et al., the entire contents of which isincorporated by reference herein.

BACKGROUND

Technical Field

The present disclosure relates to an endobronchial tool, and moreparticularly, to devices, systems, and methods for navigating anendobronchial tool to access tissue located outside a bronchus.

Description of Related Art

A common interventional procedure in the field of pulmonary medicine isbronchoscopy, in which a bronchoscope is inserted into the airwaysthrough the patient's nose or mouth. When treating malignancies of thelung, microwave ablation systems are often used in conjunction with anelectromagnetic navigation (EMN) system. One such system is described inU.S. Pat. No. 6,188,355 and published PCT Application Nos. WO 00/10456and WO 01/67035, the entire contents of which are hereby incorporated byreference. An EMN system typically includes a bronchoscope, a catheterassembly containing a location sensor at its steerable distal tip (e.g.locatable guide), an extended working channel that extends beyond thereach of the bronchoscope and becomes a pathway to the target site forsubsequent diagnostic tools (e.g., biopsy tools, treatment catheters orlaser, cryogenic, radio frequency, or microwave tissue treatmentprobes), and a computer system which provides the physician, or user,with navigational views of the lung. Once the bronchoscope is insertedinto a patient's lungs, the locatable guide with the extended workingchannel is inserted into the bronchoscope. Using the navigation systemand the steerable distal tip, the locatable guide and extended workingchannel is navigated to a target location. The locatable guide is thenremoved, leaving the extended working channel in place. Subsequentdiagnostic tools can then be inserted into the extended working channeland directed to the target location.

However, in some cases, the target location or target tissue may belocated outside the bronchial walls. In this situation, it is necessaryto first insert the locatable guide through the extended working channelto guide the extended working channel towards the target tissue untilthe bronchial walls are reached. Once the locatable guide reaches thebronchial walls, the locatable guide must be removed from the extendedworking channel and a tool capable of piercing the bronchial walls isinserted into the extended working channel. The tool is used to piercethe airway wall and extend to the target lesion. The extended workingchannel is pushed over the tool and placed outside the airway wall. Inorder to confirm location of the extended working channel with respectto the lesion with the EMN system, the piercing tool is taken out of theextended working channel and the locatable guide is reinserted. Once thetarget tissue is reached, the locatable guide is removed and a biopsytool or other instrument may be inserted through the extended workingchannel in order to act on the targeted tissue (e.g., perform a biopsyor ablation of the targeted tissue).

There is a need for a tool, or locatable guide, capable of penetratingthe bronchus to access tissue located outside the bronchial walls whilemaintaining the ability to provide the physician with positionalinformation on EMN, thereby minimizing the number of steps necessary toreach a target location.

SUMMARY

Provided in accordance with the present disclosure is a bronchialpiercing catheter assembly used to navigate to target tissue in apatient under EMN guidance. The bronchial piercing catheter assemblyincludes a handle, a shaft, and a catheter tip. The shaft extends fromthe handle and includes a proximal end and a distal end, with the distalend configured to penetrate tissue. The catheter tip is located on thedistal end of the shaft and is designed to penetrate tissue. Thecatheter tip further includes a base member defined along a centrallongitudinal axis of the bronchial piercing catheter, a trailing tipmember adjacent to the base member, wherein the trailing tip membertapers relative to the base member, and a leading tip member adjacent tothe trailing tip member, wherein the leading tip member further tapersto a distal end.

According to aspects of the disclosure the trailing tip member tapers atan angle greater than the leading tip member when measured from acentral longitudinal axis of the bronchial piercing catheter. Thecatheter tip may be formed of titanium. The catheter tip has a thicknessranging from about 0.06 inches to about 0.09 inches. In embodiments, theshaft includes an inner layer and an outer layer, wherein the innerlayer is made at least in part of a composite. The inner layer mayinclude of a braided polymer composite and may have a thickness rangingfrom about 0.05 inches to about 0.07 inches. In another embodiment, thedistal end further includes a locatable guide, wherein the locatableguide includes a location sensor in operative communication with anavigation system.

According to further aspects of the disclosure, a method for marking abiopsy location in a patient's airways is also disclosed. The methodincludes loading a navigation plan into a navigation system. Thenavigation plan includes a CT volume generated from a plurality of CTimages. The method further includes inserting an extended workingchannel (EWC) into a patient's airways, the EWC including a bronchialpiercing catheter assembly with location sensor in operativecommunication with the navigation system, registering a sensed locationof the probe with the CT volume of the navigation plan, selecting atarget within the periphery outside the airways in the navigation plan,navigating the EWC and location sensor proximate the target, inserting apiercing catheter into the probe and piercing the airway walls to reachthe target, storing a position of the location sensor in the navigationsystem as a biopsy location, and performing a biopsy at the storedbiopsy location.

According to aspects of the disclosure, the method may further includeplacing a virtual marker corresponding to the biopsy location in atleast one of a 3D model of the patient's airways generated from the CTvolume or a local view of the patient's airways generated from a sliceof the CT volume. The method may also include removing a locatable guidefrom the EWC prior to inserting the piercing catheter. In anotheraspect, the method may further include locking the piercing catheterrelative to the extended working channel. In embodiments, the method mayinclude inserting the piercing catheter into a target. In anotherembodiment, the method further includes advancing the EWC over thepiercing catheter to secure the EWC in the target. In yet anotherembodiment, the method may further include removing the piercingcatheter from the EWC and inserting a biopsy tool through the EWC to thetarget to perform the biopsy.

According to aspects of the disclosure, the piercing catheter of themethod disclosed may include a catheter tip. The catheter tip mayinclude a base member defined along a central longitudinal axis of theprobe, a trailing tip member adjacent to the base member, wherein thetrailing tip member tapers relative to the base member, and a leadingtip member adjacent to the trailing tip member, wherein the leading tipmember further tapers to a distal end. According to aspects of thedisclosure the trailing tip member tapers at an angle greater than theleading tip member when measured from a central longitudinal axis of thebronchial piercing catheter. The catheter tip may be formed of atitanium metal. The catheter tip has a thickness ranging from about 0.06inches to about 0.09 inches.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a profile view of a bronchial piercing catheter assembly inaccordance with an embodiment of the present disclosure;

FIG. 1B is a side view of the proximal end of the bronchial piercingcatheter assembly of FIG. 1A;

FIG. 1C is a cross-sectional view of the catheter shaft at the indicatedarea of FIG. 1A;

FIG. 2A is a profile view of the distal piercing tip of the bronchialpiercing catheter assembly of FIG. 1A;

FIG. 2B is a cross-section view of the distal piercing tip depicted inFIG. 2A;

FIG. 3 is a perspective view of a system for identifying a location of amedical instrument in accordance with an embodiment of the presentdisclosure;

FIG. 4 is a flowchart of a method for navigating a bronchial piercingcatheter through a patient's airways in accordance with an embodiment ofthe present disclosure;

FIG. 5 is an illustration of a user interface of the workstation of FIG.3 presenting a view for marking a biopsy location in accordance with thepresent disclosure;

FIG. 6 is an illustration of the user interface of the workstation ofFIG. 3 presenting a view for marking a location of a biopsy or treatmentof the target;

FIG. 7 is an illustration of the user interface of the workstation ofFIG. 3 presenting a view showing multiple marked biopsy locations; and

FIG. 8 is a schematic diagram of a workstation configured for use withthe system of FIG. 3.

DETAILED DESCRIPTION

The present disclosure is related to medical instruments, systems, andmethods used to navigate to a specific target tissue location. Inparticular, an endobronchial tool consisting of a polymeric cathetershaft and a distal tip capable of penetrating the bronchus to accesstissue located within the periphery outside the airway is disclosed.Located at the distal end of the shaft is an electromagnetic positionand orientation sensor array allowing for a continuous depiction of thecurrent position of the endobronchial tool in a generatedthree-dimensional (3D) model of the pathway.

Detailed embodiments of such devices, systems incorporating suchdevices, and methods using the same as described below. However, thesedetailed embodiments are merely examples of the disclosure, which may beembodied in various forms. Therefore, specific structural and functionaldetails disclosed herein are not to be interpreted as limiting, butmerely as a basis for the claims and as a representative basis forallowing one skilled in the art to variously employ the presentdisclosure in virtually any appropriately detailed structure. While thefollowing embodiments are described in terms of bronchoscopy of apatient's airways, those skilled in the art will realize that the sameor similar devices, systems, and methods may be used in other lumennetworks, such as, for example, the vascular, lymphatic, and/orgastrointestinal networks as well.

FIG. 1A is an exemplary embodiment of a bronchial piercing catheter 101in accordance with one aspect of the present disclosure. The bronchialpiercing catheter 101 includes a handle 91, a catheter shaft 104, and adistal piercing tip 107 with an EM sensor 94. The EM sensor 94 issimilar to the EM sensor 94 described below with reference to FIG. 3.The catheter shaft 104 can be inserted in and navigated through extendedworking channel (EWC) 96. The catheter shaft 104 and EWC 96 areselectively lockable relative to one another via a locking mechanism 99.

FIG. 1B shows a cross-sectional view of the proximal end of bronchialpiercing catheter 101 containing an electrical connection 103 to allowthe bronchial piercing catheter 101 to couple to a tracking system, aswill be described in greater detail below. FIG. 1C depicts across-section of the catheter shaft 104. The catheter shaft 104 includesan outer polymer jacket 105 surrounding an inner layer 106 made from abraided polymer composite. The outer polymer jacket 105 has an outerdiameter of 0.076 inches and may range from about 0.06 to about 0.09inches, and has a thickness of about 0.008 inches. The inner layer 106has an inner diameter of 0.060 inches and may range from about 0.05 to0.07 inches.

FIGS. 2A and 2B illustrate the distal piercing tip 107 of the bronchialpiercing catheter 101 in accordance with one embodiment of the presentdisclosure. Distal piercing tip 107 includes a catheter tip 200 which iscomposed of two components, namely, a base member 201 defined alonglongitudinal axis “B” and a tip member 202. Tip member 202 of distalpiercing tip 107 generally tapers inwardly towards the longitudinal axis“B” to penetrating end 205. Tip member 202 defines a leading tip section204 adjacent penetrating end 205 and a trailing tip section 203. Thediameter of leading tip section 204 gradually increases from penetratingend 205 to the area of intersection of leading tip section 204 andtrailing tip section 203, in embodiments in a linear manner. Likewise,the diameter of trailing tip section 203 gradually increases from theleading tip section 204 to the base member 201. Thus, trailing tipsection 203 tapers from the base member 201 to the leading tip section204, and the leading tip section tapers further, in embodiments at adifferent angle, or pitch, than the trailing tip section 203, from thetrailing tip section 203 to the penetrating end 205. Penetrating end 205has a pointed tip that may have a sharpened edge to pierce tissue.

FIG. 2B depicts a cross-section of the distal piercing tip 107. Asdepicted in FIG. 2B, the catheter tip 200 is formed of a base member201, a trailing tip section 203, and leading tip section 204. Thecatheter tip 200 may be formed of steel, aluminum, titanium or otherappropriate metals. In embodiments, the base member 201 and the tipmember 202 of the catheter tip 200 are machined from a single metalcomponent. Alternatively, the catheter tip 200 may be formed of ceramic,a matrix material such as epoxies, or other materials suitable for thepurposes described herein. As may be appreciated by one of ordinaryskill in the art, various dimensions and angles may be used to fabricatethe catheter tip 200. For example, in one embodiment, the catheter tip200 may extend a length of about 0.165 inches over the distal piercingtip 107 and may range from about 0.1 to 0.2 inches. The leading tipsection 204 may be about 0.023 inches in length and may range from about0.02 to 0.04 inches. As measured from the central longitudinal axis “B”of the distal piercing tip 107, leading tip section 204 has an angle “C”of about 25 degrees and may range from about 20 to 30 degrees. Thetrailing tip section 203 may be about 0.027 inches in length and mayrange from about 0.02 to 0.04 inches. The trailing tip section 203 hasan angle “D” of about 50 degrees and may range from about 45 to 55degrees. The outer diameter of catheter tip 200 may be about 0.084inches and may range from about 0.07 to 0.1 inches.

The change in angle from the leading tip section 204 to the trailing tipsection 203 and from the trailing tip section 203 to the base member 201helps limit unintentional piercing of tissue. Further because of therelatively short length of the leading tip section 204, the extent ofsuch a piercing, should it occur, is also limited. As the bronchialpiercing catheter 101 is navigated to the target tissue, the leading tipsection 204 and penetrating end 205 may unintentionally prick or cuttissue, however, the increased angle of trailing tip section 203 ensuresthat the leading tip section 204 of the bronchial piercing catheter 101does not completely pierce through the tissue unless extra force isexerted on the bronchial piercing catheter 101 by the clinician. Inother words, for the distal piercing tip 107 to pierce through tissuebeyond the trailing tip section 203, additional force must be applied.

Relatedly, the increased angle of the trailing tip section 203 acts as ablunt tipped dissector providing an angled surface which helps toincrease the size of an opening created by the leading tip section 204to at least the diameter of the base member 201 as the bronchialpiercing catheter 101 is advanced through for example bronchial walltissue, or other tissue between an opening in the bronchial wall and anintended target. As described below, an extended working channel (EWC)96 (FIG. 3), within which the bronchial piercing catheter 101 isinserted, can then be advanced into the opening initially created by theleading tip section 204 and expanded by the trailing tip section 203.Such an arrangement eliminates the need for a second catheter or tissueexpander as has been used previously, thus eliminating the need foranother tool within the system, and the number of movements of toolsrequired to advance a catheter to a desired target.

With reference to FIG. 3, an electromagnetic navigation (EMN) system 10is provided in accordance with the present disclosure. One such EMNsystem is the ELECTROMAGNETIC NAVIGATION BRONCHOSCOPY® system currentlysold by Medtronic, Inc. Among other tasks that may be performed usingthe EMN system 10 are planning a pathway to target tissue, navigating apositioning assembly to the target tissue, navigating a biopsy tool tothe target tissue to obtain a tissue sample from the target tissue usingthe biopsy tool digitally marking the location where the tissue samplewas obtained, and placing one or more echogenic markers at or around thetarget.

EMN system 10 generally includes an operating table 40 configured tosupport a patient, a bronchoscope 50 configured for insertion throughthe patient's mouth and/or nose into the patient's airways, monitoringequipment 60 coupled to bronchoscope 50 for displaying video imagesreceived from bronchoscope 50, a tracking system 70 including a trackingmodule 72, a plurality of reference sensors 74, an electromagnetic fieldgenerator 76, and a workstation 80 including software and/or hardwareused to facilitate pathway planning, identification of target tissue,navigation to target tissue, and digitally marking the biopsy location.

FIG. 3 also depicts two types of catheter guide assemblies 90, 100. Bothcatheter guide assemblies 90, 100 are usable with the EMN system 10 andshare a number of common components. Each bronchial piercing catheterassembly 90, 100 includes a handle 91, which is connected to an EWC 96.The EWC 96 is sized for placement into the working channel of abronchoscope 50. In operation, a locatable guide (LG) 92, including anelectromagnetic (EM) sensor 94, is inserted into the EWC 96 and lockedinto position such that the sensor 94 extends a desired distance beyondthe distal tip of the EWC 96. The location of the EM sensor 94, and thusthe distal end of the EWC 96, within an electromagnetic field generatedby the electromagnetic field generator 76 can be derived by the trackingmodule 72, and the workstation 80. Catheter guide assemblies 90, 100have different operating mechanisms. In one embodiment, catheter guideassemblies 90, 100 contain a handle 91 that can be manipulated byrotation and compression to steer the distal tip 93 of the LG 92,extended working channel 96. Catheter guide assemblies 90 are currentlymarketed and sold by Medtronic, Inc. under the name SUPERDIMENSION®Procedure Kits. Similarly catheter guide assemblies 100 are currentlysold by Medtronic, Inc. under the name EDGE™ Procedure Kits. Both kitsinclude a handle 91, extended working channel 96, and locatable guide92. For a more detailed description of the catheter guide assemblies 90,100 reference is made to commonly-owned U.S. Patent ApplicationPublication No. 2014/0046315 filed on Mar. 15, 2013 by Ladtkow et al.,the entire contents of which are hereby incorporated by reference.

As illustrated in FIG. 3, the patient is shown lying on an operatingtable 40 with a bronchoscope 50 inserted through the patient's mouth andinto the patient's airways. Bronchoscope 50 includes a source ofillumination and a video imaging system (not explicitly shown) and iscoupled to monitoring equipment 60, e.g., a video display, fordisplaying the video images received from the video imaging system ofbronchoscope 50.

Catheter guide assemblies 90, 100 including LG 92 and EWC 96 areconfigured for insertion through a working channel of bronchoscope 50into the patient's airways (although the catheter guide assemblies 90,100 may alternatively be used without bronchoscope 50). The LG 92 andEWC 96 are selectively lockable relative to one another via a lockingmechanism 99. A six degrees-of-freedom electromagnetic tracking system70, e.g., similar to those disclosed in U.S. Pat. No. 6,188,355 andpublished PCT Application Nos. WO 00/10456 and WO 01/67035, the entirecontents of each of which is incorporated herein by reference, or anyother suitable positioning measuring system is utilized for performingnavigation, although other configurations are also contemplated.Tracking system 70 is configured for use with catheter guide assemblies90, 100 to track the position of the EM sensor 94 as it moves inconjunction with the EWC 96 through the airways of the patient, asdetailed below.

As shown in FIG. 3, electromagnetic field generator 76 is positionedbeneath the patient. Electromagnetic field generator 76 and theplurality of reference sensors 74 are interconnected with trackingmodule 72, which derives the location of each reference sensor 74 in sixdegrees of freedom. One or more of reference sensors 74 are attached tothe chest of the patient. The six degrees of freedom coordinates ofreference sensors 74 are sent to workstation 80, which includesapplication 81 where sensors 74 are used to calculate a patientcoordinate frame of reference.

In practice, the clinician uses the catheter guide assemblies 90, 100 tonavigate the EWC 96 using the LG 92 to reach a desired exit locationfrom within the luminal network of the lungs (e.g. the airways). Oncethe exit location is reached, the LG 92 is removed and the bronchialpiercing catheter 101 is inserted into the EWC 96. The bronchialpiercing catheter 101 is then advanced forward to pierce the bronchialwalls while tracking its proximity to the target. Once placed inproximity to the target, the EWC 96 is also advanced forward. Thebronchial piercing catheter 101 can then be removed, and a biopsy tool102 can be inserted into the EWC 96 and advanced to the target. The useof the bronchial piercing catheter 101 allows the navigation of the EWC96 to a target outside the airways and limits the need for livefluoroscopic images, thus reducing radiation exposure. In an alternativeembodiment (not shown), the LG 92 is integrated with the bronchialpiercing catheter 101. In this embodiment, the bronchial piercingcatheter 101 is locked inside the EWC 96 so the distal end of thebronchial piercing catheter 101 is positioned inside the distal end ofthe EWC 96. The bronchial piercing catheter 101 (with the integrated LG92) is then navigated with the EWC 96 to a desired exit location withinthe luminal network of the lungs. Once the exit location is reached, thebronchial piercing catheter 101 is advanced forward and locked relativeto the EWC 96 in a second position in which the distal end of thebronchial piercing catheter 101 is just beyond the distal end of the EWC96. The bronchial piercing catheter 101 and the EWC 96 are then advancedforward to pierce the bronchial walls while tracking its proximity tothe target. This embodiment eliminates the step of removing the LG 92 inorder to place the bronchial piercing catheter 101 through the EWC 96.

Of course, those of skill in the art will recognize that a blunt tippeddissector, or other tissue expander, including inflatable tissueexpanders could be utilized in combination with the EWC 96 and thebronchial piercing catheter 101, without departing from the scope of thepresent disclosure. Other advantages of this embodiment, and the use ofthe trailing tip section 203 as a dissector, will be described ingreater detail below.

Also shown in FIG. 3 is a biopsy tool 102 that is insertable into thecatheter guide assemblies 90, 100 following navigation to a target andremoval of the LG 92. The biopsy tool 102 is used to collect one or moretissue sample from the target tissue. The biopsy tool 102 may further beconfigured for use in conjunction with tracking system 70 to facilitatenavigation of biopsy tool 102 to the target tissue, tracking of alocation of biopsy tool 102 as it is manipulated relative to the targettissue to obtain the tissue sample, and/or marking the location wherethe tissue sample was obtained. During navigation, EM sensor 94, inconjunction with tracking system 70, enables tracking of EM sensor 94and/or biopsy tool 102 as EM sensor 94 or biopsy tool 102 is advancedthrough the patient's airways.

A variety of useable biopsy tools are described in U.S. PatentPublication Nos. 2015/0141869 and 2015/0141809 both entitled DEVICES,SYSTEMS, AND METHODS FOR NAVIGATING A BIOPSY TOOL TO A TARGET LOCATIONAND OBTAINING A TISSUE SAMPLE USING THE SAME, filed Sep. 17, 2014 andU.S. Patent Publication No. 2015/0265257 having the same title and filedDec. 9, 2014, both by Costello et al., the entire contents of each ofwhich are incorporated herein by reference and useable with the EMNsystem 10 as described herein.

In an alternative embodiment, a microwave ablation catheter can beinserted into the EWC 96 instead of a biopsy tool 102. In thisembodiment, the bronchial piercing catheter 101 can be inserted into adesired location in the target tissue (e.g. a tumor or mass), and thenthe EWC 96 is advanced over the top of the bronchial piercing catheter101 to secure the EWC 96 in the target tissue. This assures themicrowave catheter reaches the target tissue. The bronchial piercingcatheter 101 is then removed and the microwave catheter can be navigatedto the target tissue through the EWC 96. In some embodiments the EWC 96may have to be retracted after placement of the microwave ablationcatheter to enable operation of the ablation catheter.

During procedure planning, workstation 80 utilizes computed tomographic(CT) image data for generating and viewing a three-dimensional model(“3D model”) of the patient's airways, enables the identification oftarget tissue on the 3D model (automatically, semi-automatically ormanually), and allows for the selection of a pathway through thepatient's airways to the target tissue. More specifically, the CT scansare processed and assembled into a 3D volume, which is then utilized togenerate the 3D model of the patient's airways. The 3D model may bepresented on a display monitor 81 associated with workstation 80, or inany other suitable fashion. Using workstation 80, various slices of the3D volume and views of the 3D model may be presented and/or may bemanipulated by a clinician to facilitate identification of a target andselection of a suitable pathway through the patient's airways to accessthe target. The 3D model may also show marks of the locations whereprevious biopsies were performed, including the dates, times, and otheridentifying information regarding the tissue samples obtained. Thesemarks may also be selected as targets to which a pathway can be planned.Once selected, the pathway is saved for use during the navigationprocedure. An example of a suitable pathway planning system and methodis described in U.S. Patent Publication Nos. 2014/0281961; 2014/0270441;and 2014/0282216, all entitled PATHWAY PLANNING SYSTEM AND METHOD, filedon Mar. 15, 2014, the entire contents of each of which are incorporatedherein by reference.

FIG. 4 depicts a flowchart of an example method for navigating thebronchial piercing catheter 101 to a target tissue. Prior to the startof navigation, the clinician loads a navigation plan into application 81from memory 802, a USB device, or from network interface 208. Initially,LG 92 and EWC 96 are locked together via locking mechanism 99 andinserted into bronchoscope 50 such that EM sensor 94 with distal tip 93projects from the distal end of bronchoscope 50. The clinician theninserts bronchoscope 50 into the patient in step S402. Bronchoscope 50may, for example, be inserted via the patient's mouth or nose.

The clinician advances bronchoscope 50, LG 92, and EWC 96 into eachregion of the patient's airways in step S404 until registration hasoccurred between the location of EM sensor 94 of LG 92 and the 3D volumeof the navigation plan. Further disclosure of the process ofregistration is disclosed in U.S. patent application Ser. No.14/790,581, entitled REAL-TIME AUTOMATIC REGISTRATION FEEDBACK, filed onJul. 2, 2015, by Brown, the entire contents of which are incorporatedherein by reference.

Once registration is complete, user interface 816 presents the clinicianwith a view 600, similar to that shown in FIG. 5 to assist the clinicianin navigating LG 92 and EWC 96 to the target 604. View 600 may include alocal view 602, a 3D map dynamic view 606, and a bronchoscope view 608.Local view 602 presents the clinician with a slice 610 of the 3D volumelocated at and aligned with the distal tip 93 of LG 92. The slice 610 ispresented from an elevated perspective. Local view 602 also presents theclinician with a visualization of the distal tip 93 of LG 92 in the formof a virtual probe 612. Virtual probe 612 provides the clinician with anindication of the direction that distal tip 93 of LG 92 is facing sothat the clinician can control the advancement of the LG 92 and EWC 96in the patient's airways.

3D map dynamic view 606 presents a dynamic 3D model 614 of the patient'sairways generated from the 3D volume of the loaded navigation plan. Theorientation of dynamic 3D model 614 automatically updates based onmovement of the EM sensor 94 within the patient's airways to provide theclinician with a view of the dynamic 3D model 614 that is relativelyunobstructed by airway branches that are not on the pathway to thetarget 604. 3D map dynamic view 606 also presents the virtual probe 612to the clinician as described above where the virtual probe 612 rotatesand moves through the airways presented in the dynamic 3D model 606 asthe clinician advances the EM sensor 94 through corresponding patientairways.

Bronchoscope view 608 presents the clinician with a real-time imagereceived from the bronchoscope 50 and allows the clinician to visuallyobserve the patient's airways in real-time as bronchoscope 50 isnavigated through the patient's airways toward target 604.

The clinician navigates bronchoscope 50 toward the target 604 until thepatient's airways become too small for bronchoscope 50 to pass andwedges bronchoscope 50 in place. LG 92 and EWC 96 are then extended frombronchoscope 50 and the clinician navigates LG 92 and EWC 96 toward thetarget 604 using view 600 of user interface 816 in S406 until a barrieror bronchial walls are reached, preventing navigation of the LG 92 andEWC 96 towards the target 604. The LG 92 is then removed and thebronchial piercing catheter 101 is inserted into the EWC 96. In analternative embodiment, the bronchial piercing catheter 101 is advancedthrough the airways without the need for the use of an LG 92 because thebronchial piercing catheter 101 may also be equipped with an EM sensor94. The EM sensor on the piercing catheter 101 may operate alone or incombination with one or more EM sensors on the EWC 96. The clinicianthen applies additional force on the bronchial piercing catheter 101 topierce through the barrier or bronchial walls in S408. The leading tipsection 204 allows the bronchial piercing catheter 101 to pierce throughthe barrier and allow the EWC 96 to navigate further towards the target604. The bronchial piercing catheter 101 is then advanced towards thetarget and the EWC 96 subsequently advanced over the bronchial piercingcatheter 101 in S410 until the virtual probe 612 is adjacent to orinserted into target 604, as shown, for example, in FIG. 5.

The clinician may electronically mark the location of a biopsy byactivating a “mark position” button 616 to virtually mark the positionof virtual probe 612 in the 3D volume which corresponds to theregistered position of EM sensor 94 on the piercing bronchial catheter101 in step S412. Activating the “mark position” button 616 causes userinterface 816 to present a view 700 including details of the markedposition, as shown in FIG. 6. For example, view 700 may indicate adistance to the target center 618 and a biopsy position number 620. Asdescribed in greater detail below, this marked location of the biopsy isthen stored in memory of the workstation 80 and associated with therecord of the biopsy procedure for the patient. For example screen shotsof the locations may be incorporated into a report for a clinician toconsider when evaluating either the sufficiency of the biopsy or theadequacy of the sampling locations, etc. These reports and the dataassociated with them may also be stored as part of the patient'selectronic medical record as would be understood by those of ordinaryskill in the art.

After activating the “mark position” button 616, the clinician mayremove piercing bronchial catheter 101 from EWC 96 and bronchoscope 50and insert a biopsy tool 102 into bronchoscope 50 and EWC 96 to obtain atissue sample at the target 604 in step S414. In some embodiments, theclinician then removes biopsy tool 102 from EWC 96 and bronchoscope 50and reinserts LG 92. When LG 92 reaches the distal end of EWC 96, theclinician activates a “done” button 624 in view 700 indicating that thebiopsy is complete. The EWC and LG 92 may then be utilized to navigateto another portion of that target or to another target, and the samesteps as described above may be repeated until all targets are biopsied.Though described herein in a specific order, the perform biopsy stepS414 and the mark location step S412 may be performed in any order.

During the biopsy, application 81 stores the position marked by virtualprobe 612 within the patient's airways and places a virtual marker 622in both the 3D model 614 and local view 602 of view 600 to mark thelocation where the tissue sample was obtained. The storing of theposition and placement of virtual marker 622 may be performed uponactivation of the “mark position” button 616 in view 600, during thebiopsy, or upon activation of the “done” button 624 in view 700.Additionally, the location where the tissue sample is obtained may alsobe physically marked by, for example, implanting an echogenic marker ora dye which can be detected in future CT scans of the patient and insome instances compared to the locations of the virtual markers 622stored in the CT image data and/or the navigation plan. In oneembodiment, a marker is inserted in to the EWC 96 and advanced or pushedout of the EWC 96 using the LG 92 to mark the location the biopsy wastaken. After the tissue sample is obtained and the location is marked,the clinician may remove biopsy tool 102 from bronchoscope 50 andprovide the tissue sample to a rapid on-site evaluation (“ROSE”)clinician for immediate testing or submit to a lab for routine testing.

The clinician determines in step S416 whether another biopsy needs to beperformed at target 604. If another biopsy needs to be performed, theclinician repositions either LG 92 or bronchial piercing catheter 101relative to target 604 in step S418 using view 600 and repeats stepsS412 to S416. As described above, the use of bronchial piercing catheter101 enables insertion of the EWC 92 into the target 604, thus holding itin the desired location while the bronchial piercing catheter 101 isremoved and the biopsy tool is inserted. If no further biopsies arerequired for target 604, the clinician determines if there is anothertarget to be biopsied in step S420. For example, the clinician mayactivate a target selection button 623 of view 600 to see if navigationto another target has been planned. If another target is available, theclinician may initiate navigation to the new target by activating targetselection button 623 and may repeat steps S410 to S420 for the newtarget as described above.

As illustrated in FIG. 7, a virtual marker 622 may be presented in view800 for each marked biopsy location and the clinician may return to aspecified biopsy location at a later time, for example, upon receiving aresult of the ROSE testing to perform further biopsies or treatment. Thevirtual marker 622 may be saved as part of the navigation plan, and mayinclude additional information relating to the biopsy, such as the dateand time when the tissue sample was obtained, the results of relatedtesting performed on the tissue sample, and/or other information relatedto the biopsy. The virtual marker 622 may also be used as a futuretarget for planning additional pathways using the navigation plan. Forexample, application 81 may automatically create a pathway to storedvirtual markers 622 based on the pathway planned for target 604 sincethe pathway is already known. Alternatively, the actual path taken tothe virtual marker 622 by the LG 92 may be stored in association withthe virtual marker 622. The clinician may also select which virtualmarkers 622 are displayed by activating a virtual marker menu 626 andselecting a virtual marker position 628 corresponding to the biopsyposition number 620 from view 616, as shown, for example, in FIG. 5.

Turning now to FIG. 8, there is shown a system diagram of workstation80. Workstation 80 may include memory 802, processor 804, display 806,network interface 208, input device 810, and/or output module 812.

Memory 802 includes any non-transitory computer-readable storage mediafor storing data and/or software that is executable by processor 804 andwhich controls the operation of workstation 80. In an embodiment, memory802 may include one or more solid-state storage devices such as flashmemory chips. Alternatively or in addition to the one or moresolid-state storage devices, memory 802 may include one or more massstorage devices connected to the processor 804 through a mass storagecontroller (not shown) and a communications bus (not shown). Althoughthe description of computer-readable media contained herein refers to asolid-state storage, it should be appreciated by those skilled in theart that computer-readable storage media can be any available media thatcan be accessed by the processor 804. That is, computer readable storagemedia includes non-transitory, volatile and non-volatile, removable andnon-removable media implemented in any method or technology for storageof information such as computer-readable instructions, data structures,program modules or other data. For example, computer-readable storagemedia includes RAM, ROM, EPROM, EEPROM, flash memory or other solidstate memory technology, CD-ROM, DVD, Blu-Ray or other optical storage,magnetic cassettes, magnetic tape, magnetic disk storage or othermagnetic storage devices, or any other medium which can be used to storethe desired information and which can be accessed by workstation 80.

Memory 802 may store application 81 and/or CT data 814. Application 81may, when executed by processor 804, cause display 806 to present userinterface 816. Network interface 208 may be configured to connect to anetwork such as a local area network (LAN) consisting of a wired networkand/or a wireless network, a wide area network (WAN), a wireless mobilenetwork, a Bluetooth network, and/or the internet. Input device 810 maybe any device by means of which a user may interact with workstation 80,such as, for example, a mouse, keyboard, foot pedal, touch screen,and/or voice interface. Output module 812 may include any connectivityport or bus, such as, for example, parallel ports, serial ports,universal serial busses (USB), or any other similar connectivity portknown to those skilled in the art.

Various methods for generating the 3D model are envisioned, some ofwhich are more fully described in co-pending U.S. Patent PublicationNos. 2014/0281961, 2014/0270441, and 2014/0282216, all entitled PATHWAYPLANNING SYSTEM AND METHOD, filed on Mar. 15, 2013, by Baker, the entirecontents of all of which are incorporated herein by reference. Alocation sensor may be incorporated into different types of tools andcatheters to track the location and assist in navigation of the tools.Navigation of the location sensor or tool is more fully described inco-pending U.S. patent application Ser. No. 14/753,288, entitled SYSTEMAND METHOD FOR NAVIGATING WITHIN THE LUNG, filed on Jun. 29, 2015, byBrown et al., the entire contents of which is incorporated herein byreference. The tracked location of the location sensor may also be usedto virtually mark on a three-dimensional model of the airways of apatient the location within the airways of the patient where a biopsy ortreatment is performed.

Additional features of the EMN system of the present disclosure aredescribed in co-pending U.S. patent application Ser. No. 14/754,058,entitled INTELLIGENT DISPLAY, filed on Jun. 29, 2015, by KEHAT et al.;Ser. No. 14/788,952, entitled UNIFIED COORDINATE SYSTEM FOR MULTIPLE CTSCANS OF PATIENT LUNGS, filed on Jul. 1, 2015, by Greenburg; Ser. No.14/790,395, entitled ALIGNMENT CT, filed on Jul. 2, 2015, by Klein etal.; Ser. No. 14/725,300, entitled FLUOROSCOPIC POSE ESTIMATION, filedon May 29, 2015, by Merlet; Ser. No. 14/753,674, entitled TRACHEAMARKING, filed on Jun. 29, 2015, by Lachmanovich et al.; Ser. Nos.14/755,708, and 14/755,721, both entitled SYSTEM AND METHOD FORDETECTING TRACHEA, filed on Jun. 30, 2015, by Markov et al.; Ser. No.14/754,867, entitled SYSTEM AND METHOD FOR SEGMENTATION OF LUNG, filedon Jun. 30, 2015, by Markov et al.; Ser. No. 14/790,107, entitled SYSTEMAND METHOD OF PROVIDING DISTANCE AND ORIENTATION FEEDBACK WHILENAVIGATING IN 3D, filed on Jul. 2, 2015, by Lachmanovich et al.; andSer. No. 14/751,257, entitled DYNAMIC 3D LUNG MAP VIEW FOR TOOLNAVIGATION INSIDE THE LUNG, filed on Jun. 26, 2015, by Weingarten etal., the entire contents of all of which are incorporated herein byreference.

While several embodiments of the disclosure have been shown in thedrawings, it is not intended that the disclosure be limited thereto, asit is intended that the disclosure be as broad in scope as the art willallow and that the specification be read likewise. Therefore, the abovedescription should not be construed as limiting but merely asexemplifications of particular embodiments. Those skilled in the artwill envision other modifications within the scope and spirit of theclaims appended hereto.

What is claimed is:
 1. A bronchial piercing catheter assembly used tonavigate to target tissue in a patient, the bronchial piercing catheterassembly comprising: a handle; a shaft extending from the handle andincluding a proximal end and a distal end, the distal end configured topenetrate tissue; and a catheter tip located on the distal end andconfigured to penetrate tissue, the catheter tip including: a basemember defined along a central longitudinal axis of the bronchialpiercing catheter; a trailing tip member adjacent to the base member,wherein the trailing tip member tapers relative to the base member; anda leading tip member adjacent to the trailing tip member, wherein theleading tip member further tapers to a distal end.
 2. The bronchialpiercing catheter assembly of claim 1, wherein the trailing tip membertapers at an angle greater than the leading tip member when measuredfrom a central longitudinal axis of the bronchial piercing catheter. 3.The bronchial piercing catheter assembly of claim 1, wherein thecatheter tip is titanium.
 4. The bronchial piercing catheter assembly ofclaim 1, wherein the catheter tip has a thickness ranging from about0.06 inches to about 0.09 inches.
 5. The bronchial piercing catheterassembly of claim 1, wherein the shaft comprises an inner layer and anouter layer, wherein the inner layer is comprised of a composite.
 6. Thebronchial piercing catheter assembly of claim 5, wherein the inner layerhas a thickness ranging from about 0.05 inches to about 0.07 inches. 7.The bronchial piercing catheter assembly of claim 5, wherein thecomposite is a braided polymer composite.
 8. The bronchial piercingcatheter assembly of claim 1, wherein the distal end further comprises alocatable guide, wherein the locatable guide includes a location sensorin operative communication with a navigation system.
 9. A method formarking a biopsy location in a patient's airways, the method comprising:loading a navigation plan into a navigation system, the navigation planincluding a CT volume generated from a plurality of CT images; insertingan extended working channel (EWC) into a patient's airways, the EWCincluding a location sensor in operative communication with thenavigation system; registering a sensed location of the EWC with the CTvolume of the navigation plan; selecting a target within the peripheryoutside the airways in the navigation plan; navigating the EWC andlocation sensor proximate the target, inserting a piercing catheter intothe EWC and piercing the airway wall to reach the target; storing aposition of the location sensor in the navigation system as a biopsylocation; and performing a biopsy at the stored biopsy location.
 10. Themethod according to claim 9, further comprising placing a virtual markercorresponding to the biopsy location in at least one of a 3D model ofthe patient's airways generated from the CT volume or a local view ofthe patient's airways generated from a slice of the CT volume.
 11. Themethod according to claim 9, further comprising removing a locatableguide from the EWC prior to inserting the piercing catheter.
 12. Themethod of according to claim 11, further comprising locking the piercingcatheter relative to the EWC.
 13. The method of claim 11, furthercomprising inserting the piercing catheter into a target.
 14. The methodof claim 13, further comprising advancing the EWC over the piercingcatheter to secure the EWC in the target.
 15. The method according toclaim 14, further comprising removing the piercing catheter from the EWCand inserting a biopsy tool through the EWC to the target to perform thebiopsy.
 16. The method according to claim 9, wherein the piercingcatheter includes a catheter tip comprising: a base member defined alonga central longitudinal axis of the piercing catheter; a trailing tipmember adjacent to the base member, wherein the trailing tip membertapers relative to the base member; a leading tip member adjacent to thetrailing tip member, wherein the leading tip member further tapers to adistal end.
 17. The method according to claim 16, wherein the trailingtip member tapers at an angle greater than the leading tip member whenmeasured from a central longitudinal axis of the piercing catheter. 18.The method according to claim 16, wherein the catheter tip is titanium.19. The method according to claim 16, wherein the catheter tip has athickness ranging from about 0.06 inches to about 0.09 inches.